Large friction anisotropy of a polydiacetylene monolayer

Friction force microscopy measurements of a polydiacetylene monolayer film reveal a 300% friction anisotropy that is correlated with the film structure. The film consists of a monolayer of the red form of N‐(2‐ethanol)‐10,12‐pentacosadiynamide, prepared on a Langmuir trough and deposited on a mica s...

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Bibliographic Details
Published in:Tribology letters 1999-01, Vol.7 (2-3), p.79-85
Main Authors: Carpick, R W, Sasaki, D Y, Burns, A R
Format: Article
Language:English
Subjects:
Anisotropy
Atomic force microscopy
Backbone
Domains
Ethanol
Fluorescence
Friction
Mica
Microscopy
Monolayers
Polydiacetylenes
Stiffness
Substrates
Tribology
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Summary:Friction force microscopy measurements of a polydiacetylene monolayer film reveal a 300% friction anisotropy that is correlated with the film structure. The film consists of a monolayer of the red form of N‐(2‐ethanol)‐10,12‐pentacosadiynamide, prepared on a Langmuir trough and deposited on a mica substrate. As confirmed by atomic force microscopy and fluorescence microscopy, the monolayer consists of domains of linearly oriented conjugated backbones with pendant hydrocarbon side chains above and below the backbones. Maximum friction occurs when the sliding direction is perpendicular to the backbones. We propose that this effect is due to anisotropic film stiffness, which is a result of anisotropic side chain packing and/or anisotropic stiffness of the backbone itself. Friction anisotropy is therefore a sensitive, optically‐independent indicator of polymer backbone direction and monolayer structural properties.
ISSN:1023-8883
1573-2711
DOI:10.1023/A:1019113218650